copper has an atomic weight of 63.55u. if 69.17% of Cu
exists as Cu-63 ( 62.93960u ), what is the identity and the atomic
mass of the isotope?
a. Cu-64; 64.16u
b. Cu-65; 64.16u
c. Cu-66; 65.91u
d. Cu-65; 64.92u
e. Cu-64; 63.82u
please tell me which answer it is and why
answer is D.
69.17%= 0.6917
63.55 = 0.6917 x 62.93960 + (1-0.6917) x X
(63.55) = 0.6917(62.9360) + 0.3083(X)
X = (63.55 - 0.6917 x 62.93960) / 0.3083
X = 64.92.....Cu-65
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